<template>
  <div>
    <!--  面包屑导航区域  -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>
    <!--  卡片视图  -->
    <el-card>
      <el-alert title="注意：只允许第三级设置相关参数" type="warning" :closable="false" show-icon ></el-alert>
      <!--  选择商品分类  -->
      <el-row class="ctop">
        <el-col>
          <span>选择商品分类：</span>
          <el-cascader
              expand-trigger="hover"
              :options="cateList"
              :props="cateProps"
              v-model="selectedCateKeys"
              @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!--  tab页签区  -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">动态参数
          <el-button :disabled="isBtnDisable" @click="addDialogVisible = true">添加参数</el-button>
          <!--    动态属性表格      -->
          <el-table :data="manyTableData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签  -->
                <el-tag closable v-for="(item,i) in scope.row.attr_vals"
                        :key="i" @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框  -->
                <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)" >
                </el-input>
                <!-- 添加按钮  -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">静态属性
          <el-button :disabled="isBtnDisable" @click="addDialogVisible = true">添加属性</el-button>
          <!--    静态属性表格      -->
          <el-table :data="onlyTableData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签  -->
                <el-tag closable v-for="(item,i) in scope.row.attr_vals"
                        :key="i" @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框  -->
                <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)" >
                </el-input>
                <!-- 添加按钮  -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!--  添加参数对话框  -->
    <el-dialog
        :title="'添加'+titleText"
        :visible.sync="addDialogVisible"
        width="50%"  @close="addDialogClosed">
      <span>添加信息</span>
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" >
        <el-form-item label="参数名称" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" >
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!--  修改参数对话框  -->
    <el-dialog
        :title="'修改'+titleText"
        :visible.sync="editDialogVisible"
        width="50%"  @close="editDialogClosed" >
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" >
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    name: "Params",
    data() {
      return {
        cateList: [],
        //级联选择器双向绑定到的数组
        selectedCateKeys: [],
        cateProps: {
          value: "cat_id",
          label: "cat_name",
          children: "children"
        },
        //被激活页签的名称
        activeName: 'many',
        //动态参数的数据
        manyTableData: [],
        //静态属性的数据
        onlyTableData: [],
        //添加表单的验证规则
        addFormRules: {
          attr_name: [{required: true, message: '请输入活动名称', trigger: 'blur'}]
        },
        //添加参数的表单数据对象
        addForm: {
          attr_name: ''
        },
        //控制添加参数对话框的显示与隐藏
        addDialogVisible: false,
        //控制修改属性对话框的显示与隐藏
        editDialogVisible: false,
        //
        editForm: {},
        //修改属性的验证规则
        editFormRules: {
          attr_name: [{required: true, message: '请输入活动名称', trigger: 'blur'}]
        },
      }
    },
    created() {
      this.getCateList()
    },
    computed: {
      //如果按钮要被禁用，则返回true，否则返回false
      isBtnDisable() {
        return this.selectedCateKeys.length !== 3;
      },
      //当前选中三级分类的id
      cateId() {
        if (this.selectedCateKeys.length === 3) {
          return this.selectedCateKeys[2]
        }
        return null
      },
      titleText() {
        if (this.activeName === 'many') {
          return '动态参数'
        } else {
          return '静态属性'
        }
      }
    },
    methods: {
      //获取所有的商品分类列表
      async getCateList() {
        const {data: res} = await this.$http.get('categories')
        if (res.meta.status !== 200) {
          return this.$message.error("获取商品分类列表错误")
        }
        this.cateList = res.data
        console.log(this.cateList)
      },
      //级联选择框选中项变化，会触发这个函数
      handleChange() {
        this.getParamsData()
      },
      //tab页签点击事件的处理函数
      handleTabClick() {
        console.log(this.activeName)
        this.getParamsData()
      },
      //获取参数的列表数据
      async getParamsData() {
        if (this.selectedCateKeys.length !== 3) {
          this.selectedCateKeys = []
          this.manyTableData = []
          this.onlyTableData = []
          return
        }
        //根据所选分类的id，和当前所处的面板，获取对应的参数
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: this.activeName}})
        if (res.meta.status !== 200) {
          return this.$message.error("获取参数列表失败")
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          item.inputVisible = false   //控制文本输入框的显示与隐藏
          item.inputValue = ''    //文本输入框中的值
        })
        console.log(res.data)
        if (this.activeName === 'many') {
          this.manyTableData = res.data
        } else {
          this.onlyTableData = res.data
        }
      },
      //监听添加对话框的关闭事件
      addDialogClosed() {
        this.$refs.addFormRef.resetFields()
      },
      //点击按钮，添加参数
      addParams() {
        this.$refs.addFormRef.validate(async volid => {
          if (!volid) return
          const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`, {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          })
          if (res.meta.status !== 201) {
            return this.$message.error("添加参数失败")
          }
          this.$message.success("添加参数成功")
          this.addDialogVisible = false
          await this.getParamsData()
        })
      },
      //监听添加对话框的关闭事件
      editDialogClosed() {
        this.$refs.editFormRef.resetFields()
      },
      //点击按钮，展示修改的对话框
      async showEditDialog(attr_id) {
        //查询当前参数的信息
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
          params: {attr_sel: this.activeName}
        })
        if (res.meta.status !== 200) {
          return this.$message.error("获取参数信息错误")
        }
        this.editForm = res.data
        this.editDialogVisible = true
      },
      //点击按钮，修改属性
      editParams() {
        this.$refs.editFormRef.validate(async valid => {
          if (!valid) return
          const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          })
          if (res.meta.status !== 200) {
            return this.$message.error("修改失败")
          }
          this.$message.success("修改成功")
          this.getParamsData()
          this.editDialogVisible = false
        })
      },
      //根据id删除对应的参数项目
      async removeParams(attr_id) {
        const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        //用户取消了删除
        if (confirmResult !== 'confirm') {
          return this.$message.info("你取消了删除操作")
        }
        //删除逻辑
        const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if (res.meta.status !== 200) {
          return this.$message.error("删除失败")
        }
        this.$message.success("删除成功")
        this.getParamsData()
      },
      //文本框失去焦点或按下enter都会触发
      async handleInputConfirm(row) {
        if (row.inputValue.trim().length === 0) {
          row.inputValue = ''
          row.inputVisible = false
          return
        }
        //如果没有return则证明输入内容，需要做后续处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false
        this.saveAttrValus(row)
      },
      //将对attr_valus的操作保存到数据库
      async saveAttrValus(row) {
        const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        })
        if (res.meta.status !== 200) {
          return this.$message.error("修改参数项失败")
        }
        this.$message.success("修改参数项成功")
      },

    //点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true
      //让文本框自动获得焦点
      //$nextTick 方法的作用，就是当页面上的元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
        console.log(_)
      });
    },
    //删除对应的参数可选项
    handleClose(i,row){
      row.attr_vals.splice(i,1)
      this.saveAttrValus(row)
    }



    },
    }

</script>

<style scoped>
  .ctop{
    margin: 15px;
  }
  .el-tag{
    margin: 10px;
  }
  .input-new-tag{
    width: 150px;
  }
</style>